Girlfriend is a song by Canadian pop singer Avril Lavigne, released as the lead single from her third studio album, The Best Damn Thing. It was produced by Lukasz Gottwald. Girlfriend became Lavigne s biggest hit in the United States, where it became her first number one single in the U.S. Billboard Hot 100. It topped the chart in Australia for 6 weeks, and reached number two in the United Kingdom. A remix featuring rapper Lil Mama was released in June 2007.Screenshot: